From the Manufacturer:
Obtained from the dried, ground fruit of various chili peppers (Capsicum annuum), Cayenne will set your taste buds ablaze in the best possible way! Famous for its fiery heat, Cayenne Pepper is a hot, zesty way to give your meals some gusto. It contains the beneficial compound capsacin, which gives it its fiery flavor. Considering its heat, Cayenne is definitely a spice that you’ll want to use sparingly.